There has been a remarkable global decline in the number of children women are having, say researchers. Study found fertility rate falls meant nearly half of countries were now facing a "baby bust" - meaning there are insufficient children to maintain their population size.

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There has been a remarkable global decline in the number of children women are having, say researchers. Study found fertility rate falls meant nearly half of countries were now facing a "baby bust" - meaning there are insufficient children to maintain their population size.